You could make the same argument for pretty much any show still on the air after 4 years.
Well, except for
Dexter, Curb Your Enthusiasm and...okay, I guess those are the only shows I watch that are that old.
How long a show needs to run is something you can generally tell from the premise. On rare occasions a show can evolve mid-stream into a new premise and get a new lease on life.
Chuck's premise was good for a two or three year run. They did have the option of expanding the premise in the Christmas episode where Chuck saw Sarah kill a guy in cold blood - that could have been used to pivot the show's tone to something less jokey and more durable - but then they swept it under the rug and that's when I knew the clock was truly ticking for the useful life of the show.
Curb Your Enthusiasm can go on indefinitely because there is apparently no end to the trivial BS that Larry David can find to argue about, or the embarrassing situations he can get into.
Dexter's good for five or six seasons, and in their case, I'm afraid they're going to do what they shouldn't - try to stretch things out even further. Much as I love it, they
really need to be thinking about ending that show within the next two seasons.
Anyway, looks like
the 13 episodes will definitely be Chuck's last. I guess that makes it worth watching, or at least jumping back in for the series finale, but I'll skip the filler episodes leading up to that point.